JPWO2017203609A1 - Break detection device - Google Patents

Abstract

The break detection device includes a sensor, a storage unit (20), and a break determination unit (24). For example, when vibration occurs in the main rope (4) of the elevator, the output signal of the sensor fluctuates. The output signal from the sensor is, for example, a torque signal from the hoisting machine (11). The storage unit (20) stores the fluctuation of the output signal from the sensor in association with the position of the elevator car (1). The break determination unit (24) determines whether or not the break portion (4c) is present in the main rope (4) based on the position of the car (1) and the transition of the fluctuation of the output signal from the sensor.

Description

  The present invention relates to an apparatus for detecting a breakage of a strand generated on a rope or a breakage of a strand.

  Various ropes are used in the elevator apparatus. For example, an elevator car is suspended from a hoistway by a main rope. The main rope is wound around a pulley such as a driving sheave of the hoist. Since the main rope is repeatedly bent by the movement of the car, it gradually deteriorates. When the main rope deteriorates, the strands constituting the main rope break. When a large number of strands are broken, the strand in which the strands are twisted may be broken. Moreover, the breakage of the strands or the breakage of the strand also occurs when a foreign object is caught between the main rope and the pulley.

  The broken strand or strand protrudes from the surface of the main rope. For this reason, when the operation of the elevator is performed in a state where the strands or strands are broken, the broken strands or strands come into contact with the equipment provided in the hoistway.

  Patent Documents 1 and 2 describe an elevator apparatus. In the elevator apparatus described in Patent Document 1, a rope guide is provided on a driving sheave of a hoisting machine. Further, the vibration of the rope guide is detected by a sensor. Based on the vibration detected by the sensor, it is detected that the strand or the strand is broken.

  In the elevator apparatus described in Patent Document 2, the car is provided with an accelerometer. Based on the acceleration detected by the accelerometer, it is detected that the strand or the strand is broken.

Japanese Patent No. 5203339 Japanese Unexamined Patent Publication No. 10-81462

  In the elevator apparatus, the range through which the main rope passes is predetermined for each pulley. For example, a certain range of the main rope passes through the drive sheave. The portion that passes through the drive sheave does not necessarily pass through the suspended suspension wheel. For this reason, if it is going to detect the break of a strand or the break of a strand using the sensor indicated in patent documents 1, it is necessary to attach a sensor to the position of each pulley on which a main rope is wound. For example, when a sensor is attached to the position of a suspension weight of a counterweight, a signal line must be laid between the counterweight and the control device. There is a problem that a large number of sensors are required and a signal line has to be drawn from each sensor, resulting in a complicated configuration. In particular, in a 2: 1 roping type elevator apparatus in which many pulleys are used, such a problem becomes significant.

  In the elevator apparatus described in Patent Document 2, the breakage of the strand or the breakage of the strand is detected from the sudden acceleration detected by the accelerometer. However, the accelerometer detects sudden acceleration not only when an element breakage or strand breakage occurs. For example, if the oil applied to the rails is depleted, the car will swing slightly as the car passes through the rail joint. In the elevator apparatus described in Patent Document 2, such an event can also be detected as a broken wire or a broken strand.

  The present invention has been made to solve the above-described problems. An object of the present invention is to provide a breakage detection device capable of accurately detecting the breakage of a strand or a strand with a simple configuration.

  A break detection device according to the present invention includes a sensor that changes an output signal when vibration is generated in an elevator rope, a storage unit that stores the change in the output signal from the sensor in association with the position of the elevator car, and a car. Breaking determination means for determining whether or not there is a broken portion on the rope based on the position of and the transition of the fluctuation of the output signal from the sensor.

  Further, the break detection device according to the present invention includes a sensor that changes an output signal when vibration occurs in an elevator rope, and a storage unit that stores the change in the output signal from the sensor in association with the position of the elevator car. The rope breaks based on the reproducibility of the car position when the fluctuation of the output signal from the sensor exceeds the first threshold and the reproducibility of the car position when the second threshold greater than the first threshold is exceeded. Breaking determination means for determining whether or not a portion exists.

  A breakage detection apparatus according to the present invention includes a sensor, a storage unit, and a breakage determination unit. When vibration occurs on the rope, the sensor changes its output signal. Changes in the output signal from the sensor are stored in the storage means in association with the position of the car. The break determination means determines whether or not a broken portion exists in the rope based on the contents stored in the storage means. With the break detection device according to the present invention, it is possible to accurately detect the breakage of the strands or strands with a simple configuration.

It is a figure which shows an elevator apparatus typically. It is a perspective view which shows a return wheel. It is a figure which shows the cross section of a return wheel. It is a figure for demonstrating a mode that the fracture | rupture part of a main rope moves. It is a figure for demonstrating a mode that the fracture | rupture part of a main rope moves. It is a figure for demonstrating a mode that the fracture | rupture part of a main rope moves. It is a figure which shows the output of a sensor signal. It is a figure which shows the output of a sensor signal. It is a figure which shows the example of the fracture | rupture detection apparatus in Embodiment 1 of this invention. It is a flowchart which shows the operation example of the fracture | rupture detection apparatus in Embodiment 1 of this invention. It is a flowchart which shows the detailed operation example of the fracture | rupture detection apparatus in Embodiment 1 of this invention. It is a flowchart which shows the detailed operation example of the fracture | rupture detection apparatus in Embodiment 1 of this invention. It is a figure which shows the state which the fracture | rupture part contacted the stopper. It is a figure for demonstrating an example of the function of an abnormal variation detection part. It is a figure for demonstrating an example of the function of a reproducibility determination part. It is a figure for demonstrating an example of the function of a reproducibility determination part. It is a figure which shows an elevator apparatus typically. It is a figure which shows the output of a sensor signal. It is a figure which shows transition of the amplitude of the fluctuation | variation which arose in the sensor signal. It is a figure which shows transition of the amplitude of the fluctuation | variation which arose in the sensor signal. It is a figure shown in three dimensions combining FIG.19 and FIG.20. It is a flowchart which shows the other operation example of the fracture | rupture detection apparatus in Embodiment 1 of this invention. It is a figure which shows transition of the amplitude of the fluctuation | variation which arose in the sensor signal. It is a figure which shows transition of the amplitude of the fluctuation | variation which arose in the sensor signal. It is a flowchart which shows the other operation example of the fracture | rupture detection apparatus in Embodiment 1 of this invention. It is a figure which shows transition of the amplitude of the fluctuation | variation which arose in the sensor signal. It is a flowchart which shows the other operation example of the fracture | rupture detection apparatus in Embodiment 1 of this invention. It is a flowchart which shows the other operation example of the fracture | rupture detection apparatus in Embodiment 1 of this invention. It is a flowchart which shows the operation example of the fracture | rupture detection apparatus in Embodiment 2 of this invention. It is a figure for demonstrating an example of the function of an abnormal variation detection part. It is a figure for demonstrating the advantage of using a some sensor signal. It is a figure which shows the hardware constitutions of a control apparatus.

  The present invention will be described with reference to the accompanying drawings. The overlapping description will be simplified or omitted as appropriate. In each figure, the same reference numerals indicate the same or corresponding parts.

Embodiment 1 FIG.
FIG. 1 is a diagram schematically showing an elevator apparatus. The car 1 moves up and down the hoistway 2. The hoistway 2 is, for example, a space formed in a building and extending vertically. The counterweight 3 moves up and down the hoistway 2. The car 1 and the counterweight 3 are suspended from the hoistway 2 by the main rope 4. The roping method for suspending the car 1 and the counterweight 3 is not limited to the example shown in FIG. For example, the car 1 and the counterweight 3 may be suspended from the hoistway 2 by 1: 1 roping. Hereinafter, an example in which the car 1 and the counterweight 3 are suspended by 2: 1 roping will be specifically described.

  One end 4 a of the main rope 4 is supported by the fixed body of the hoistway 2. The end 4 a is the end closer to the car 1 among the ends of the main rope 4. For example, the end 4 a of the main rope 4 is supported by a fixed body provided at the top of the hoistway 2. The main rope 4 extends downward from the end 4a. The main rope 4 is wound around the suspension vehicle 5, the suspension vehicle 6, the return wheel 7, the driving sheave 8, the return wheel 9, and the suspension wheel 10 sequentially from the end 4 a side. The main rope 4 extends upward from a portion wound around the suspension wheel 10. The other end 4 b of the main rope 4 is supported by the fixed body of the hoistway 2. The end 4 b is the end closer to the counterweight 3 among the ends of the main rope 4. For example, the end 4 b of the main rope 4 is supported by a fixed body provided at the top of the hoistway 2.

  The car 5 and the car 6 are provided in the car 1. The suspension vehicle 5 and the suspension vehicle 6 are provided, for example, in the lower part of the car floor. The suspension vehicle 5 and the suspension vehicle 6 can rotate with respect to the car floor. The return wheel 7 and the return wheel 9 are provided, for example, on a fixed body at the top of the hoistway 2. The return wheel 7 and the return wheel 9 are rotatable with respect to the fixed body at the top of the hoistway 2. The driving sheave 8 is provided in the hoisting machine 11. The hoisting machine 11 is provided in the pit of the hoistway 2, for example. The suspension vehicle 10 is provided on the counterweight 3. The suspension vehicle 10 is provided, for example, on an upper portion of a frame that supports a weight. The suspension vehicle 10 is rotatable with respect to the frame.

  The arrangement of the pulley around which the main rope 4 is wound is not limited to the example shown in FIG. For example, the drive sheave 8 may be disposed in the top of the hoistway 2 or in a machine room (not shown) above the hoistway 2.

  The scale device 12 detects the loaded load of the car 1. The scale device 12 detects the load of the car 1 based on, for example, the load applied to the end 4a of the main rope 4. The scale device 12 outputs a scale signal corresponding to the detected load. The scale signal output from the scale device 12 is input to the control device 13.

  The hoisting machine 11 has a function of detecting torque. The hoisting machine 11 outputs a torque signal corresponding to the detected torque. The torque signal output from the hoisting machine 11 is input to the control device 13.

  The governor 15 operates an emergency stop (not shown) when the descending speed of the car 1 exceeds the reference speed. An emergency stop is provided on the car 1. When the emergency stop operates, the car 1 is forcibly stopped. The governor 15 includes a governor rope 16, a governor sheave 17, and an encoder 18, for example. The speed control rope 16 is wound around the speed control sheave 17. When the car 1 moves, the speed control rope 16 moves. When the speed control rope 16 moves, the speed control sheave 17 rotates. The encoder 18 outputs a rotation signal corresponding to the rotation direction and rotation angle of the governing sheave 17. The rotation signal output from the encoder 18, that is, the encoder signal from the speed governor 15 is input to the control device 13. The encoder 18 is an example of a sensor that outputs a signal corresponding to the position of the car 1.

  FIG. 2 is a perspective view showing the return wheel 9. FIG. 3 is a view showing a cross section of the return wheel 9. A stopper 19 is provided on a member that supports the return wheel 9. 2 and 3 show an example in which a detent 19 is provided on the shaft 9a of the return wheel 9. FIG. The stopper 19 prevents the main rope 4 from coming off the groove of the return wheel 9. For example, the stopper 19 faces the portion of the main rope 4 wound around the groove of the return wheel 9 with a gap. If there is no abnormality in the main rope 4, the main rope 4 does not contact the stopper 19.

  2 and 3 show an example in which the fracture portion 4 c protrudes from the surface of the main rope 4. The broken portion 4 c is a portion where the wire constituting the main rope 4 is broken. The broken portion 4c may be a portion where a strand in which strands are twisted is broken. When the car 1 moves, the breaking portion 4 c comes into contact with the stopper 19 when passing through the return wheel 9.

  2 and 3 show a return wheel 9 as an example of a pulley around which the main rope 4 is wound. The suspension vehicle 5, the suspension vehicle 6, the return wheel 7, the driving sheave 8, and the suspension vehicle 10 may be provided with a detent having the same function as the detent 19.

  4-6 is a figure for demonstrating a mode that the fracture | rupture part 4c of the main rope 4 moves. FIG. 4 shows a state where the car 1 is stopped at the lowest floor landing. In the example shown in FIG. 4, a broken portion 4 c exists between portions of the main rope 4 wound around the suspension wheel 5 from the end portion 4 a.

  FIG. 6 shows a state where the car 1 is stopped at the landing on the top floor. In the example shown in FIG. 6, a fracture portion 4 c exists between a portion of the main rope 4 wound around the return wheel 7 and a portion wound around the drive sheave 8. That is, when the car 1 moves from the lowest floor landing to the top floor landing, the breaking portion 4c sequentially passes through the suspension vehicle 5, the suspension vehicle 6, and the return wheel 7. Even if the car 1 moves from the lowest floor landing to the top floor landing, the breaking portion 4c does not pass through the driving sheave 8, the return wheel 9, and the suspension wheel 10. That is, the fracture | rupture part 4c does not necessarily pass all the pulleys. The combination of pulleys through which the breakage portion 4c passes is determined by the position where the breakage portion 4c occurs.

  FIG. 5 shows a state where the car 1 is moving from the lowest floor hall to the top floor hall. Specifically, FIG. 5 shows a state when the fracture portion 4 c passes through the suspension wheel 5. The breaking portion 4 c comes into contact with a detachment stop provided on the suspension vehicle 5 when passing through the suspension vehicle 5.

  7 and 8 are diagrams showing the output of the sensor signal. FIG. 7A and FIG. 8A show the position of the car 1. In the example shown in the present embodiment, the position of the car 1 is synonymous with the height at which the car 1 exists. FIGS. 7A and 8A show changes in the car position when the car 1 moves from the lowest floor (position 0) to the position P and then returns to the lowest floor. The waveforms shown in FIGS. 7A and 8A are acquired based on a rotation signal from the encoder 18, for example.

FIG. 7B and FIG. 8B show the torque of the hoisting machine 11. The waveform shown in FIG. 7B and FIG. 8B is a waveform of a torque signal output from the hoisting machine 11, for example. FIGS. 7B and 8B show an example in which the maximum torque when the car 1 moves between the lowest floor and the position P is T _q1 and the minimum torque is −T _q2 . FIG. 7C and FIG. 8C show the loading load of the car 1. The waveforms shown in FIG. 7C and FIG. 8C are waveforms of a scale signal output from the scale device 12, for example. FIG.7 (c) and FIG.8 (c) show the example whose loading load of the cage | basket | car 1 is w [kg].

FIG. 7 shows an example of a waveform obtained when the main rope 4 does not have the fracture portion 4c. 8, there are breaks 4c to the main ropes 4 shows an example of a waveform obtained when passing through the pulley is broken portion 4c when the car 1 passes the position P _1. The breaking part 4c contacts the stopper when passing through the pulley. Thereby, when the fracture | rupture part 4c passes a pulley, a vibration generate | occur | produces in the main rope 4. FIG. When the end 4a of the main rope 4 is displaced, the scale signal output from the scale device 12 is affected. When vibration is generated in the main rope 4 and the generated vibration reaches the end 4a of the main rope 4, the scale signal from the scale device 12 varies. Similarly, when the portion of the main rope 4 wound around the driving sheave 8 is displaced, the torque signal output from the hoisting machine 11 is affected. When vibration occurs in the main rope 4 and the generated vibration reaches the portion of the main rope 4, the torque signal from the hoisting machine 11 varies.

  FIG. 9 is a diagram showing an example of a breakage detection apparatus according to Embodiment 1 of the present invention. FIG. 10 is a flowchart showing an operation example of the breakage detection apparatus according to Embodiment 1 of the present invention. The control device 13 includes, for example, a storage unit 20, a car position detection unit 21, an abnormal fluctuation detection unit 22, a reproducibility determination unit 23, a break determination unit 24, an operation control unit 25, and a notification unit 26.

  Hereinafter, the function and operation of the breakage detection apparatus will be specifically described with reference to FIGS. 11 and 12 are flowcharts showing a detailed operation example of the breakage detection apparatus according to Embodiment 1 of the present invention. FIG. 12 shows an operation flow following FIG. That is, FIG. 11 and FIG. 12 show a series of operation flows.

  The abnormal fluctuation detection unit 22 detects the fluctuation of the sensor signal (S101). In the example shown in the present embodiment, for example, a scale signal and a torque signal can be employed as the sensor signal. In addition to the example shown in the present embodiment, for example, an acceleration signal from an accelerometer (not shown) provided in the car 1 can be adopted as a sensor signal. That is, when vibration occurs in the main rope 4, the acceleration signal varies as well as the scale signal and the torque signal. Below, the example which employ | adopts a torque signal as a sensor signal is described in detail. The abnormal fluctuation detection unit 22 detects the fluctuation generated in the torque signal in S101.

  FIG. 13 is a view showing a state in which the fracture portion 4 c is in contact with the detachment stopper 19. When the car 1 moves and reaches a position, the fracture portion 4c contacts the stopper 19 as shown in FIG. After the fracture portion 4 c comes into contact with the locking stopper 19, it is deformed while being rubbed against the locking stopper 19 as the main rope 4 moves. Thereafter, the fracture portion 4 c is detached from the release stopper 19.

The contact between the broken portion 4c and the stopper 19 acts as a forced disturbance to the elevator. For example, when the fracture portion 4 c comes into contact with the stopper 19, abnormal fluctuations appear in the torque signal from the hoisting machine 11. This abnormal fluctuation has a component in a specific frequency band corresponding to the length of the fractured portion 4 c and the moving speed of the main rope 4. If the length of the fracture portion 4c is d [m] and the moving speed of the main rope 4 is v [m / s], the frequency f [Hz] of abnormal fluctuation (vibration) can be expressed by the following equation.
f = v / d (1)

  FIG. 14 is a diagram for explaining an example of the function of the abnormal fluctuation detection unit 22. The abnormal fluctuation detection unit 22 includes, for example, a band pass filter 27, an amplifier 28, and a determination unit 29. In order to simplify the description, the bandpass filter is also referred to as BPF in the drawings and the like. As described above, when the fractured portion 4 c comes into contact with the detachment stopper 19, an abnormal fluctuation appears in the torque signal from the hoisting machine 11. However, this variation may have a small amplitude. For this reason, in the example shown in the present embodiment, the abnormal fluctuation detection unit 22 includes an amplifier 28 for amplifying a signal.

  First, the abnormal fluctuation detection unit 22 performs a filtering process on the input torque signal (S111). For example, the bandpass filter 27 extracts a signal component in the characteristic frequency band. The signal component in the characteristic frequency band is a signal component that is generated when the fracture portion 4 c existing in the main rope 4 comes into contact with the detachment stopper for the main rope 4. This characteristic frequency includes the frequency f calculated from the above equation (1). The length d is a value set as the length of the fracture portion 4c generated in the main rope 4. The length of the breaking portion 4c is set as, for example, the length of the broken strand when the strands of 0.5 pitch to several pitches are broken. The moving speed v of the main rope 4 is determined according to the moving speed of the car 1. For example, the moving speed v of the main rope 4 can be calculated from the rated speed of the car 1.

The amplifier 28 squares the output signal u from the band pass filter 27 and amplifies the signal. In the present embodiment, a signal component extracted and amplified in the characteristic frequency band is called a bandpass filter output or a filter output. That is, in the example shown in the present embodiment, the output signal Y (= u ² ) from the amplifier 28 is the bandpass filter output. In the example shown in the present embodiment, the sign of the bandpass filter output is positive. When the abnormal fluctuation detection unit 22 does not include the amplifier 28, the output signal u from the bandpass filter 27 is a bandpass filter output.

  The abnormal fluctuation detection unit 22 illustrated in FIG. 14 is an example. The abnormal fluctuation detection unit 22 may include a non-linear filter to extract a signal component in the characteristic frequency band. An adaptive filter algorithm may be applied to the abnormal fluctuation detection unit 22 to extract a signal component in the band of the characteristic frequency.

  The determiner 29 determines whether the torque signal varies, that is, whether the output signal Y from the amplifier 28 exceeds the threshold value TH1 (S112). The threshold value TH1 to be compared with the output signal Y is stored in advance in the storage unit 20, for example. When the determiner 29 determines that the output signal Y does not exceed the threshold value TH1, the operation control unit 25 controls normal operation (S127).

  The car position detector 21 detects the position of the car 1. The car position detection unit 21 detects the position of the car 1 based on, for example, the rotation signal output from the encoder 18. Note that the method by which the car position detection unit 21 detects the position is not limited to the example shown in the present embodiment. For example, the hoist 11 includes an encoder. The encoder provided in the hoist 11 is also an example of a sensor that outputs a signal corresponding to the position of the car 1. The car position detector 21 may detect the position of the car 1 based on the encoder signal from the hoisting machine 11. The speed governor 15 may have a function of detecting the position of the car 1. The hoisting machine 11 may have a function of detecting the position of the car 1. In such a case, a signal indicating the position of the car 1 is input to the control device 13.

  When it is determined in S112 that the output signal Y exceeds the threshold value TH1, the car position detection unit 21 detects the position of the car 1 (S113).

  If the output signal Y obtained in S111 exceeds the threshold value TH1, the abnormal fluctuation detection unit 22 obtains the output signal Y obtained in S111 and the position P of the car 1 when the output signal Y is obtained. It memorize | stores in the memory | storage part 20 (S114). The storage unit 20 stores the output signal Y from the amplifier 28 and the position P detected by the car position detection unit 21 in association with each other. In each example shown in the present embodiment, it is desirable to store not only a part of the output signals Y but also all the output signals Y in the storage unit 20 in association with the car positions.

  Next, the abnormal fluctuation detection unit 22 determines whether or not the detection of the output signal Y exceeding the threshold value TH1 is performed a plurality of times (S115). When the detection of the output signal Y exceeding the threshold value TH1 is not a plurality of times, the abnormal fluctuation detecting unit 22 determines that the occurrence of the abnormal fluctuation is the first time (S116). In such a case, the operation control unit 25 controls normal operation (S127).

  Next, the reproducibility determination unit 23 detects the reproducibility of the fluctuation generated in the sensor signal (S102).

FIG. 15 is a diagram for explaining an example of the function of the reproducibility determination unit 23. FIG. 15A shows the position of the car 1. In the example shown in FIG. 15, the car 1 passes through the position P ₁ at time t ₁ , time t ₂ , time t ₃ and time t ₄ . FIG. 15B shows the torque of the hoisting machine 11. FIG. 15C shows the bandpass filter output. When the broken portion 4c exists in the main rope 4, the broken portion 4c comes into contact with the stopper when the car 1 passes a certain position. Figure 15 shows an example in which the rupture portion 4c contacts the stop off when the car 1 passes the position P _1.

When the broken part 4c exists in the main rope 4, the position of the car when the broken part 4c is in contact with the detachment stopper is the same. For this reason, if the breaking part 4c exists in the main rope 4, the cage | basket | car position will be memorize | stored in the memory | storage part 20 whenever the cage | basket | car 1 passes the position where the breaking part 4c contacts a come-off stop. In the example illustrated in FIG. 15, the position P ₁ is stored in the storage unit 20 at time t ₁ , time t ₂ , time t _3, and time t ₄ . For this reason, if there is reproducibility in the car position when the output signal Y exceeding the threshold TH1 is detected, it can be seen that there is a high possibility that the broken portion 4c exists in the main rope 4.

When it is determined in S115 that the output signal Y exceeding the threshold value TH1 is detected a plurality of times, the reproducibility determining unit 23 determines whether or not the car position when the output signal Y exceeds the threshold value TH1 is reproducible. Is determined (S117). For example, when the plurality of positions P stored in the storage unit 20 can be regarded as the same position, the reproducibility determination unit 23 determines that there is reproducibility in S117. For example, when a plurality of positions P stored in the storage unit 20 exist in a certain range, the positions P can be regarded as the same position. The certain range is set in advance in consideration of, for example, the accuracy of detecting the car position. In the example shown in FIG. 15, the reproducibility determination section 23 determines that there is a reproducible at position P _1.

When the reproducibility determining unit 23 determines that there is reproducibility in S117, the reproducibility determining unit 23 stores the number of times that the output signal Y exceeds the threshold value TH1 at the position, that is, the position that can be regarded as the same (S118). . In the example shown in FIG. 15, at time t _2, it is stored in the storage unit 20 exceeds the number of threshold TH1 at the position P ₁ is 2 times.

  If the reproducibility determination unit 23 determines that there is no reproducibility in S117, it determines that the detection of the output signal Y exceeding the threshold value TH1 is caused by a variation that occurs randomly in the torque signal (S119). In such a case, the operation control unit 25 controls normal operation (S127).

  In step S117, the reproducibility determination unit 23 determines that there is reproducibility when the output signal Y exceeds the threshold value TH1 for a plurality of times when the car 1 passes through a position that can be regarded as the same. Also good.

FIG. 16 is a diagram for explaining an example of the function of the reproducibility determination unit 23. FIG. 16A shows the latest bandpass filter output obtained when the car 1 travels in the section from position 0 to position P. FIG. In the example shown in FIG. 16 (a), at position _{P 1} and the position _{P 2,} the output signal Y from the amplifier 28 exceeds the threshold TH1. FIG. 16B shows the band-pass filter output before traveling obtained when the car 1 travels in the same section. In the example shown in FIG. 16B, the output signal Y exceeds the threshold value TH1 at the position P ₁ , the position P ₂ and the position P ₃ .

For example, consider an example in which when the car 1 passes through a position that can be regarded as the same and the output signal Y exceeds the threshold value TH1 for two consecutive times, it is determined that there is reproducibility in S117. In position _{P 1} and the position _{P 2,} the output signal Y exceeds the threshold value TH1 for two consecutive times. In this case, reproducibility determination section 23 determines that there is a reproducible at position P ₁ and the position P _2. On the other hand, in the position _{P 3,} the output signal Y does not exceed the threshold TH1 in FIG. 16 (a). In this case, reproducibility determination section 23 does not determine that there is reproducibility in the position P _3. Variations in FIG 16 (b) the position P ₃ shown in, it is determined that the passenger has been caused by the event no reproducible such was jumping in the car 1.

  Next, the break determination unit 24 detects the presence or absence of the break portion 4c (S103).

  FIG. 17 is a diagram schematically illustrating an elevator apparatus. In FIG. 17, the description of the control device 13 and the governor 15 is omitted. The movement of the car 1 is guided by a guide rail provided in the hoistway 2. The guide rail includes a large number of rails 30. A guide rail is arrange | positioned over the movement range of the cage | basket | car 1 by connecting the several rail 30 up and down. For this reason, a seam exists between the rail 30 and the rail 30 disposed immediately above or directly below the rail 30.

  When the oil applied to the rail 30 is depleted, the car 1 slightly swings when the car 1 passes through the joint of the rail 30. Since the main rope 4 is wound around the suspension car 5 and the suspension car 6, vibration occurs in the main rope 4 when the car 1 is shaken. For this reason, when the car 1 passes through the joint of the rail 30, the sensor signal may fluctuate. The sensor signal may also fluctuate when there is a step at the joint of the rail 30.

FIG. 18 is a diagram illustrating the output of the sensor signal. 18 passes through the seam of the rail 30 the car 1 at the position P _4, shows an example where variation occurs in the sensor signal. When a change occurs in the sensor signal when the car 1 passes through the joint of the rail 30, the position of the car when the change occurs is the same. In the example shown in FIG. 18, the variation in the sensor signal each time the car 1 passes the position P ₄ is generated. The variation of the sensor signal caused by the joint of the rail 30 is similar to the variation of the sensor signal caused by the fracture portion 4c in that the car position at the time of occurrence is reproducible. In the present embodiment, an example will be described in which fluctuations that occur in the sensor signal are distinguished from those caused by the fracture portion 4 c and those caused by the joint of the rail 30.

  FIG. 19 and FIG. 20 are diagrams showing the transition of the amplitude of the fluctuation generated in the sensor signal. 19 and 20, the vertical axis represents the bandpass filter output and represents a value corresponding to the amplitude of the fluctuation that has occurred in the sensor signal. The horizontal axis indicates the number of elevator activations. The horizontal axis in FIGS. 19 and 20 may be, for example, the elapsed time since the elevator was installed.

Figure 19 shows changes in the output signal Y obtained when the car 1 passes the position P _1. At the number of activations M1, the broken portion 4c does not occur in the main rope 4. FIG. 19 shows an example in which a break 4c occurs in the main rope 4 when the number of activations is M2. The breakage of the strand and the breakage of the strand occur suddenly. For this reason, the fluctuation of the sensor signal due to the fractured portion 4c occurs suddenly. When the broken portion 4c occurs in the main rope 4, the value of the output signal Y suddenly increases compared to the previous value. Moreover, when the fracture | rupture part 4c generate | occur | produces in the main rope 4, as shown in FIG. 19, the output signal Y will show a big value continuously after that.

Figure 20 shows changes in the output signal Y obtained when the car 1 passes the position P _4. The amount of oil applied to the rail 30 does not change suddenly. The oil applied to the rail 30 gradually decreases, and eventually is depleted if no oil is supplied. For this reason, the fluctuation of the sensor signal due to the joint of the rail 30 gradually increases over time. FIG. 21 is a diagram three-dimensionally combining FIGS. 19 and 20. In the present embodiment, an example will be described in which the break determination unit 24 detects the presence of the break portion 4c from the contents stored in the storage unit 20 based on the position of the car 1 and the change in the sensor signal.

  When the excess number of the threshold value TH1 is stored in the storage unit 20 in S118, the fracture determination unit 24 determines whether or not the output signal Y obtained in S111 exceeds the threshold value TH2 (S120). The threshold value TH2 compared with the output signal Y is larger than the threshold value TH1. The threshold value TH2 is stored in advance in the storage unit 20, for example. If the output signal Y does not exceed the threshold value TH2, the break determination unit 24 determines that the detection of the output signal Y exceeding the threshold value TH1 is caused by a slight fluctuation generated in the torque signal (S121). The slight fluctuation occurs, for example, when the car 1 passes through the joint of the rail 30. In such a case, the operation control unit 25 controls normal operation (S127).

  If the output signal Y exceeds the threshold value TH2, the break determination unit 24 causes the storage unit 20 to store the number of times that the output signal Y exceeds the threshold value TH2 at that position (S122). Next, the break determination unit 24 determines whether or not the number of times the threshold value TH2 exceeds the threshold value TH2 stored in the storage unit 20 in S122 is a plurality of times (S123). If the break determination unit 24 determines in S123 that the number of times of excess is plural, it determines that the break portion 4c has occurred in the main rope 4 (S124). In such a case, the operation control unit 25 stops the car 1 at the nearest floor. The reporting unit 26 reports to the elevator management company (S125).

  If the break determination unit 24 determines that the number of times of excess is not a plurality of times in S123, since the threshold TH2 is exceeded for the first time, the break determination unit 24 suspends the determination of the presence or absence of the break portion 4c (S126). In such a case, the operation control unit 25 controls normal operation (S127).

  In S123, the break determination unit 24 may determine whether or not the number of times the threshold value TH2 has been exceeded has reached a specified number. In such a case, the break determination unit 24 determines that the break portion 4c has occurred in the main rope 4 if the number of times the threshold value TH2 has been exceeded has reached the specified number (S124). On the other hand, if the number of times the threshold value TH2 has not exceeded the prescribed number, the break determination unit 24 suspends the determination of the presence or absence of the break portion 4c (S126). The specified number of times is set to, for example, three times or more.

  In the break detection device shown in the present embodiment, the presence of the break portion 4c is detected using a sensor whose output signal varies when vibration occurs in the main rope 4. As the sensor signal, for example, a torque signal or a scale signal can be used. For this reason, if it is a fracture | rupture detection apparatus shown to this Embodiment, it is not necessary to provide a sensor for exclusive use in order to determine the presence or absence of the fracture | rupture part 4c. Moreover, if there is at least one sensor, the presence of the fracture portion 4c can be detected. It is not necessary to provide a large number of sensors in order to determine the presence or absence of the fracture portion 4c. For this reason, a structure can be simplified.

  In the breakage detection apparatus shown in the present embodiment, the breakage determination unit 24 determines the presence or absence of the breakage part 4c based on the position of the car 1 and the change of the sensor signal. With the break detection device shown in the present embodiment, it is possible to distinguish whether the fluctuation generated in the sensor signal is caused by the break portion 4 c or the joint of the rail 30. For this reason, the detection accuracy of the fracture | rupture part 4c improves.

  Specifically, in the above example, the break determination unit 24 determines the break portion based on the reproducibility of the car position when the fluctuation of the sensor signal exceeds the threshold value TH1 and the reproducibility of the car position when the change of the sensor signal exceeds the threshold value TH2. The presence or absence of 4c is determined. As shown in FIG. 24, the fluctuation of the sensor signal due to the joint of the rail 30 gradually increases over time. For this reason, even if the car position when the fluctuation of the sensor signal exceeds the threshold value TH1 is reproducible, the breakage determination unit 24 does not add the broken part to the main rope 4 if the fluctuation of the sensor signal does not exceed the threshold value TH2. It is not determined that 4c exists. The fracture determination unit 24 determines, for example, that the variation is caused by passing the joint of the rail 30. By adopting the two threshold values TH1 and TH2, it is possible to distinguish whether the fluctuation generated in the sensor signal is caused by the fracture portion 4c or the joint of the rail 30.

  The thresholds TH1 and TH2 may be set by performing a learning operation. In such a case, for example, the control device 13 includes a threshold setting unit (not shown). The threshold setting unit sets the thresholds TH1 and TH2 based on, for example, fluctuations in sensor signals during learning operation.

  The learning operation is performed, for example, when the elevator installation is completed. In the learning operation, for example, the car 1 is moved from the lowest floor to the highest floor. Then, filter processing is performed on the torque signal acquired at that time. For example, the threshold value setting unit sets a constant multiple of the maximum value of the fluctuation of the sensor signal acquired in the learning operation as the threshold value TH1, and sets a value larger than that value as the threshold value TH2. The threshold setting unit may set a constant multiple of the maximum value of the sensor signal variation as the threshold TH2, and set a value smaller than the threshold TH1 as the threshold TH1.

  The torque signal from the hoisting machine 11 fluctuates after installation of the elevator due to aging. For this reason, the thresholds TH1 and TH2 may be updated periodically. It is desirable that the thresholds TH1 and TH2 are updated at short intervals. For example, considering the operation status of the elevator, the learning operation is performed in a time zone where there are few users such as at night. If the learning operation is performed at the same speed as the normal operation speed for bringing the user to the destination floor, it is possible to detect the occurrence of the fracture portion 4c during the normal operation. Periodic inspections by elevator maintenance personnel can be eliminated.

  FIG. 22 is a flowchart showing another example of operation of the fracture detection device according to Embodiment 1 of the present invention. FIG. 22 shows an operation flow following FIG. That is, FIG. 11 and FIG. 22 show a series of operation flows. The operations shown in S120 to S127 of FIG. 22 are the same as the operations disclosed in the present embodiment. The operation shown in FIG. 22 is different from the operation shown in FIG. 12 in that there is S128 between S122 and S123.

  FIG. 23 and FIG. 24 are diagrams showing the transition of the amplitude of the fluctuation generated in the sensor signal. In FIG. 23 and FIG. 24, the vertical axis represents a band-pass filter output, and shows a value corresponding to the amplitude of the fluctuation generated in the sensor signal. The horizontal axis indicates the number of elevator activations. The horizontal axis in FIGS. 23 and 24 may be, for example, the elapsed time since the elevator was installed.

Figure 23 shows changes in the output signal Y obtained when the car 1 passes the position P _1. Until the number of activations reaches M4, the fracture portion 4c does not occur in the main rope 4. FIG. 23 shows an example in which a broken portion 4c occurs in the main rope 4 when the number of activations is M5. In the example shown in FIG. 23, when the number of activations is M5, the value of the output signal Y suddenly increases compared to the previous value.

Figure 24 shows changes in the output signal Y obtained when the car 1 passes the position P _4. As described above, the fluctuation of the sensor signal due to the joint of the rail 30 gradually increases over time. In the example shown in FIG. 24, the output signal Y does not exceed the threshold value TH2 until the number of activations reaches M4. However, when the number of activations is M5, the output signal Y exceeds the threshold value TH2. The example shown in FIG. 23 matches the example shown in FIG. 24 in that the output signal Y exceeds the threshold value TH2 for the first time when the number of activations is M5. FIG. 22 shows an example of operation that can distinguish whether the variation in the sensor signal is caused by the fracture portion 4 c or the joint of the rail 30 in the example shown in FIGS. 23 and 24. Indicates.

  The abnormal fluctuation detection unit 22 detects an abnormal fluctuation of the sensor signal (S101). Further, the reproducibility determination unit 23 detects the reproducibility of fluctuations that occur in the sensor signal (S102).

  Next, the break determination unit 24 detects the presence or absence of the break portion 4c (S103). For example, when the break determination unit 24 stores the excess number of the threshold TH2 in the storage unit 20 in S122, the break determination unit 24 determines whether or not the number of times the output signal Y exceeds the threshold TH1 at the position is equal to or less than the specified number ( S128). As shown in FIG. 23, when the broken part 4c occurs in the main rope 4, the output signal Y suddenly increases. For this reason, when it is determined in S128 that the number of times of excess is equal to or less than the specified number of times, there is a high possibility that the fracture portion 4c has occurred in the main rope 4. If the excess number is less than or equal to the specified number in S128, the break determination unit 24 proceeds to the process shown in S123.

  On the other hand, as shown in FIG. 24, when the oil applied to the rail 30 is exhausted, the output signal Y gradually increases. For this reason, when it is determined in S128 that the excess number is not less than the prescribed number, it can be determined that the detection of the output signal Y exceeding the threshold value TH2 is caused by a slight fluctuation. If the excess number is not less than the specified number in S128, the break determination unit 24 proceeds to the process shown in S121.

  The specified number of times compared with the number of times the threshold value TH1 is exceeded in S128 is stored in advance in the storage unit 20, for example. The specified number of times is set to, for example, three times or more.

  In the operation example shown in FIG. 22, even when the car position when the fluctuation of the sensor signal exceeds the threshold value TH1 is reproducible, the break determination unit 24 before the fluctuation of the sensor signal exceeds the threshold value TH2 at that position. When the number of times that the threshold value TH1 has been exceeded is greater than the specified number, it is not determined that the main rope 4 has the broken portion 4c. The fracture determination unit 24 determines, for example, that the variation is caused by passing the joint of the rail 30. For this reason, the detection accuracy of the fracture | rupture part 4c can further be improved.

  FIG. 25 is a flowchart showing another example of operation of the breakage detection apparatus according to Embodiment 1 of the present invention. FIG. 25 shows an operation flow subsequent to FIG. That is, FIG. 11 and FIG. 25 show a series of operation flows. The operations shown in S120 to S128 in FIG. 25 are the same as the operations disclosed in the present embodiment. The operation shown in FIG. 25 is different from the operation shown in FIG. 22 in that there is S129 after it is determined No in S128.

  FIG. 26 is a diagram illustrating the transition of the amplitude of the fluctuation generated in the sensor signal. In FIG. 26, the vertical axis represents the bandpass filter output and represents a value corresponding to the amplitude of the fluctuation that has occurred in the sensor signal. The horizontal axis shows the elapsed time since the elevator was installed. The horizontal axis in FIG. 26 may be the number of elevator activations.

  FIG. 26 shows an example in which a break 4c occurs in the main rope 4 when the time T2 has elapsed. FIG. 26 shows an example in which the breaking portion 4 c contacts the stopper at a position where the car 1 passes through the joint of the rail 30. FIG. 25 shows an operation example in which it is possible to distinguish whether the variation generated in the sensor signal is caused by the fracture portion 4c or the joint of the rail 30 in the example shown in FIG.

  The abnormal fluctuation detection unit 22 detects an abnormal fluctuation of the sensor signal (S101). Further, the reproducibility determination unit 23 detects the reproducibility of fluctuations that occur in the sensor signal (S102).

  Next, the break determination unit 24 detects the presence or absence of the break portion 4c (S103). For example, when the break determination unit 24 stores the excess number of the threshold TH2 in the storage unit 20 in S122, the break determination unit 24 determines whether or not the number of times the output signal Y exceeds the threshold TH1 at the position is equal to or less than the specified number ( S128). If the break determination unit 24 determines in S128 that the excess number is equal to or less than the specified number, the process proceeds to the process shown in S123.

  If the break determination unit 24 determines in S128 that the excess number is not equal to or less than the specified number, the break determination unit 24 calculates a difference γ between the latest value of the output signal Y at the position and the previous value. And the fracture | rupture determination part 24 determines whether the calculated difference (gamma) is more than the reference value (alpha) (S129). As shown in FIG. 26, the output signal Y gradually increases unless the broken portion 4 c is generated in the main rope 4. For this reason, when it is determined in S129 that the difference γ is not equal to or larger than the reference value α, it can be determined that the detection of the output signal Y exceeding the threshold value TH2 is caused by a slight fluctuation. If the difference γ is not greater than or equal to the reference value α in S129, the break determination unit 24 proceeds to the process shown in S121.

  On the other hand, as shown in FIG. 26, when the broken portion 4c occurs in the main rope 4, the output signal Y suddenly increases. For this reason, when it determines with difference (gamma) being more than the reference value (alpha) in S129, it can determine with the fracture | rupture part 4c having generate | occur | produced in the main rope 4. FIG. If the difference γ is greater than or equal to the reference value α in S129, the break determination unit 24 proceeds to the process shown in S124.

  In the operation example illustrated in FIG. 25, the break determination unit 24 determines the presence or absence of the break portion 4c by comparing the difference γ with the reference value α if No in S128. No is determined in S128 because the car position when the sensor signal variation exceeds the threshold value TH1 is reproducible and the sensor signal variation exceeds the threshold value TH2 before the threshold value TH2 is exceeded at that position. Is more than the specified number of times. If the difference γ is not equal to or greater than the reference value α, the break determination unit 24 does not determine that the main rope 4 has the break portion 4c. For example, the break determination unit 24 determines that the change in the sensor signal is caused by passing through the joint of the rail 30. For this reason, the detection accuracy of the fracture | rupture part 4c can further be improved.

  27 and 28 are flowcharts showing another example of operation of the breakage detection apparatus according to Embodiment 1 of the present invention. 27 and 28 show an operation flow subsequent to FIG. That is, FIG. 11, FIG. 27 and FIG. 28 show a series of operation flows. The operations shown in S120 to S129 in FIG. 27 and FIG. 28 are the same as the operations disclosed in the present embodiment. The operation shown in FIGS. 27 and 28 is different from the operation shown in FIG. 25 in that there are S130 to S132 after S129. 27 and 28 show another operation example in which the above distinction can be made even when the breaking portion 4c contacts the stopper at a position where the car 1 passes through the joint of the rail 30. FIG.

  The abnormal fluctuation detection unit 22 detects an abnormal fluctuation of the sensor signal (S101). Further, the reproducibility determination unit 23 detects the reproducibility of fluctuations that occur in the sensor signal (S102).

  Next, the break determination unit 24 detects the presence or absence of the break portion 4c (S103). For example, if the break determination unit 24 determines in S128 that the excess number is not less than or equal to the specified number, it determines whether or not the difference γ is greater than or equal to the reference value α (S129). If the break determination unit 24 determines in S129 that the difference γ is greater than or equal to the reference value α, the break determination unit 24 stores in the storage unit 20 that the difference γ greater than or equal to the reference value α is detected at the position (S130). In such a case, the operation control unit 25 controls normal operation (S127).

  If the difference γ is not greater than or equal to the reference value α in S129, the break determination unit 24 detects a difference γ that is greater than or equal to the reference value α after the output signal Y exceeds the threshold value TH1 and reaches the threshold value TH2 at that position. It is determined whether or not (S131). If the break determination unit 24 determines in S131 that the difference γ equal to or greater than the reference value α is not detected, the process proceeds to the process illustrated in S121.

  On the other hand, when the difference γ greater than or equal to the reference value α is detected in S131, the break determination unit 24 determines whether or not the number of times that the output signal Y has exceeded the threshold value TH2 at that position is multiple (S132). . When the break determination unit 24 determines in S132 that the threshold TH2 is not exceeded a plurality of times, the operation control unit 25 controls normal operation (S127). If the number of times the threshold value TH2 is exceeded is multiple in S132, the break determination unit 24 proceeds to the process shown in S124.

  In S132, the break determination unit 24 may determine whether or not the number of times the threshold value TH2 has been exceeded has reached a specified number. In such a case, the break determination unit 24 determines that the break portion 4c has occurred in the main rope 4 if the number of times the threshold value TH2 has been exceeded has reached the specified number (S124). On the other hand, when the number of times the threshold value TH2 has not exceeded the specified number, the normal operation is controlled by the operation control unit 25 (S127). The specified number of times is set to, for example, three times or more.

Embodiment 2. FIG.
In the first embodiment, the example in which the variation of the sensor signal is associated with the car position and stored in the storage unit 20 regardless of the traveling direction of the car 1 has been described. However, depending on the protruding direction of the breaking portion 4c, when the traveling direction of the car 1 changes, the manner in which the breaking portion 4c hits the stopper is changed. For example, when the fractured portion 4c protrudes as in the example shown in FIG. 13, the manner in which the fractured portion 4c hits the right-side stopper 19 differs from when it hits from below.

  FIG. 29 is a flowchart showing an operation example of the breakage detection apparatus according to Embodiment 2 of the present invention. FIG. 29 shows an example in which the operation shown in FIG. 10 is performed in accordance with the traveling direction of the car 1. In the example shown in the present embodiment, first, the traveling direction of the car 1 is determined (S104). The operations shown in S101U to S103U in FIG. 29 are the same as the operations shown in S101 to S103 disclosed in the first embodiment. Similarly, the operations shown in S101D to S103D in FIG. 29 are the same as the operations shown in S101 to S103 disclosed in the first embodiment.

In the example shown in the present embodiment, the car position when ascending and the car position when descending are treated as different positions. That is, in the example shown in FIG. 15, the car position at time t ₁ and the car position at time t ₃ are regarded as the same position. Also considered the same position as the car position at the car position and time t ₄ at time t _2. However, not considered in the same position as the car position at the car position and time t ₂ at time t _1. Similarly, not regarded as the same position as the car position at the car position and time t ₄ at time t _3. With the break detection device shown in the present embodiment, the detection accuracy of the break portion 4c can be further improved.

Embodiment 3 FIG.
In Embodiment 1 and 2, the example which determines the presence or absence of the fracture | rupture part 4c using one type of sensor signal was demonstrated. In the present embodiment, an example will be described in which the presence or absence of the fracture portion 4c is determined using a plurality of sensor signals. Although three or more sensor signals may be used, in this embodiment, an example in which the presence or absence of the fracture portion 4c is determined using two sensor signals is shown as the simplest example.

  FIG. 30 is a diagram for explaining an example of the function of the abnormal fluctuation detection unit 22. The abnormal fluctuation detection unit 22 includes, for example, bandpass filters 27a and 27b, amplifiers 28a and 28b, determiners 29a and 28b, and a determiner 31. The bandpass filter 27a extracts a signal component in a characteristic frequency band from, for example, a torque signal. The amplifier 28a squares the output signal u1 from the bandpass filter 27a and amplifies the signal. The determiner 29a determines whether or not the output signal Y1 from the amplifier 28a exceeds the threshold value TH1.

  The bandpass filter 27b extracts a signal component in a characteristic frequency band from, for example, a scale signal. The amplifier 28b squares the output signal u2 from the bandpass filter 27b and amplifies the signal. The determiner 29b determines whether or not the output signal Y2 from the amplifier 28b exceeds the threshold value TH1.

  The determiner 31 determines whether any of the output signals Y1 and Y2 exceeds the threshold value TH1. If neither of the output signals Y1 and Y2 exceeds the threshold value TH1, normal operation is performed. If at least one of the output signals Y1 and Y2 exceeds the threshold TH1, a process for shifting to the process of the reproducibility determination unit 23 is performed. The above operation by the determiner 31 corresponds to the determination in S112.

  FIG. 31 is a diagram for explaining the advantage of using a plurality of sensor signals. FIG. 31 is a gain diagram showing the magnitude of the fluctuation level of the sensor signal when the fractured portion 4 c collides with the detent provided on the return wheel 7. G1 represents a gain from an external force to the angular velocity of the hoisting machine 11. G2 represents the gain from the external force to the scale signal.

  In the gain G1, an anti-resonance point F2 exists between the primary natural frequency F1 and the secondary natural frequency F3. An antiresonance point F4 exists between the secondary natural frequency F3 and the tertiary natural frequency F5. If the frequency of the abnormal fluctuation (vibration) when the fractured portion 4c collides with the retaining member is a value close to the antiresonance point F2 or F4, it is difficult to detect the abnormal fluctuation from the torque signal. On the other hand, the gain G2 is higher than the gain G1 at the frequency and has a good sensitivity. For this reason, when an abnormal variation is detected at a frequency close to the antiresonance point F2 or F4, detection from the scale signal is easier than from the torque signal.

  In each embodiment, the example which detects the fracture | rupture part 4c which generate | occur | produced in the main rope 4 was demonstrated. The break detection device may detect a broken portion generated in another rope used in the elevator.

  Each unit and threshold setting unit indicated by reference numerals 20 to 26 indicate functions of the control device 13. FIG. 32 is a diagram illustrating a hardware configuration of the control device 13. The control device 13 includes a processing circuit including, for example, a processor 32 and a memory 33 as hardware resources. The control device 13 may implement each function by executing a program stored in the memory 33 by the processor 32.

  The processor 32 is also called a CPU (Central Processing Unit), a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, or a DSP. As the memory 33, a semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, or a DVD may be adopted. Semiconductor memories that can be used include RAM, ROM, flash memory, EPROM, EEPROM, and the like.

  Some or all of the functions of the control device 13 may be realized by hardware. As hardware for realizing the function of the control device 13, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof may be employed.

  The breakage detection device according to the present invention can be applied to a device that detects a breakage portion generated in an elevator rope.

1 car, 2 hoistway, 3 counterweight, 4 main rope, 4a end, 4b end, 4c break, 5 suspension wheel, 6 suspension vehicle, 7 return wheel, 8 drive sheave, 9 return wheel, 9a axle , 10 suspension wheel, 11 hoisting machine, 12 weighing device,
DESCRIPTION OF SYMBOLS 13 Control apparatus, 15 Speed governor, 16 Speed control rope, 17 Speed control sheave, 18 Encoder, 19 Detachment, 20 Storage part, 21 Car position detection part, 22 Abnormal fluctuation detection part, 23 Reproducibility judgment part, 24 Break determination unit, 25 operation control unit, 26 reporting unit, 27 band pass filter, 28 amplifier, 29 determination unit, 30 rail, 31 determination unit, 32 processor, 33 memory

A break detection device according to the present invention includes a sensor that changes an output signal when vibration occurs in an elevator rope, a storage unit that stores a change in the output signal from the sensor in association with the position of the elevator car, and a sensor. Based on the first reproducibility of the car position when the fluctuation of the output signal from the car exceeds the first threshold and the second reproducibility of the car position when the second threshold greater than the first threshold is exceeded. And a break determination means for determining whether or not the broken portion exists in the rope. The break determination means has the first reproducibility and the second reproducibility, and the number of times the first threshold is exceeded when the fluctuation of the output signal from the sensor at the position exceeds the second threshold is less than the specified number In addition, it is determined that a broken portion exists in the rope.

Further, the break detection device according to the present invention includes a sensor that changes an output signal when vibration occurs in an elevator rope, and a storage unit that stores the change in the output signal from the sensor in association with the position of the elevator car. A first reproducibility of the position of the car when the fluctuation of the output signal from the sensor exceeds the first threshold, and a second reproducibility of the position of the car when the second threshold greater than the first threshold is exceeded. And a break determination means for determining whether or not a broken portion exists in the rope. Even if the break determination means has the first reproducibility, if the number of times the first threshold is exceeded when the fluctuation of the output signal from the sensor exceeds the second threshold at the position, It is not determined that a fracture portion exists.
Further, the break detection device according to the present invention includes a sensor that changes an output signal when vibration occurs in an elevator rope, and a storage unit that stores the change in the output signal from the sensor in association with the position of the elevator car. A first reproducibility of the position of the car when the fluctuation of the output signal from the sensor exceeds the first threshold, and a second reproducibility of the position of the car when the second threshold greater than the first threshold is exceeded. And a break determination means for determining whether or not a broken portion exists in the rope. The break determination means determines whether or not the difference between the latest value of the fluctuation of the output signal from the sensor at the position and the previous value is equal to or greater than a reference value. The break determination means determines that a broken portion exists in the rope when the difference is greater than or equal to a reference value.
Further, the break detection device according to the present invention includes a sensor that changes an output signal when vibration occurs in an elevator rope, and a storage unit that stores the change in the output signal from the sensor in association with the position of the elevator car. A first reproducibility of the position of the car when the fluctuation of the output signal from the sensor exceeds the first threshold, and a second reproducibility of the position of the car when the second threshold greater than the first threshold is exceeded. Based on the first reproducibility, it is determined whether or not there is a broken portion in the rope, and whether or not the fluctuation of the output signal from the sensor is caused by the rail joint through which the car has passed is determined by the first reproducibility. Rupture determination means for distinguishing whether or not the rupture portion is caused by the second reproducibility.

A breakage detection apparatus according to the present invention includes a sensor, a storage unit, and a breakage determination unit. When vibration occurs on the rope, the sensor changes its output signal. Changes in the output signal from the sensor are stored in the storage means in association with the position of the car. The break determination means determines whether or not a broken portion exists in the rope based on the first reproducibility and the second reproducibility . With the break detection device according to the present invention, it is possible to accurately detect the breakage of the strands or strands with a simple configuration.

Claims (13)

When the elevator rope vibrates, the sensor whose output signal fluctuates,
Storage means for storing the fluctuation of the output signal from the sensor in association with the position of the elevator car;
Breakage determination means for determining whether or not a breakage portion exists in the rope based on the position of the car and the transition of the fluctuation of the output signal from the sensor;
A break detection device comprising: When the elevator rope vibrates, the sensor whose output signal fluctuates,
Storage means for storing the fluctuation of the output signal from the sensor in association with the position of the elevator car;
Based on the reproducibility of the position of the car when the fluctuation of the output signal from the sensor exceeds the first threshold and the reproducibility of the position of the car when the second threshold greater than the first threshold is exceeded. Rupture determination means for determining whether or not there is a rupture portion in the rope;
A break detection device comprising:   The break determination means is configured such that even if the position of the car when the fluctuation of the output signal from the sensor exceeds the first threshold is reproducible, the fluctuation of the output signal from the sensor does not exceed the second threshold. The break detection device according to claim 2, wherein when it does not exceed, it is not determined that a break portion exists in the rope.   Even if the position of the car when the fluctuation of the output signal from the sensor exceeds the first threshold value is reproducible, the break determination means may cause the fluctuation of the output signal from the sensor at the position. The break detection device according to claim 2, wherein when the number of times the first threshold is exceeded before exceeding the second threshold is greater than the prescribed number, it is not determined that the rope has a break. The break determination means includes
The position of the car when the variation of the output signal from the sensor exceeds the first threshold is reproducible, and the variation of the output signal from the sensor at the position before the second threshold is exceeded. When the number of times exceeding one threshold is greater than the specified number, it is determined whether or not the difference between the latest value of the change in the output signal from the sensor at the position and the previous value is equal to or greater than a reference value. And
The break detection device according to claim 2, wherein when the difference is equal to or greater than the reference value, it is determined that a break portion exists in the rope.   The break detection device according to claim 5, wherein the break determination unit does not determine that a break portion exists in the rope when the difference is not equal to or greater than the reference value.   7. The abnormality variation detection unit according to claim 2, further comprising an abnormality variation detection unit that detects a variation in an output signal from the sensor and determines whether the detected variation exceeds the first threshold value. The break detection device as described.   The break detection device according to claim 7, wherein the abnormal fluctuation detection unit extracts a signal component in a band of a characteristic frequency that is generated when a break portion present in the rope comes into contact with the rope stopper. When the characteristic frequency is v [m / s] as the moving speed of the rope and d [m] as a value set as the length of the breaking portion generated in the rope,
f = v / d
The break detection device according to claim 8, including a frequency f [Hz] represented by:   The break detection device according to any one of claims 2 to 9, further comprising a threshold setting unit that sets the first threshold and the second threshold based on a change in an output signal from the sensor.   The output signal from the sensor is a torque signal from a hoisting machine having a driving sheave around which the rope is wound or a weighing signal from a weighing device that detects a load of the car. The breakage detection device according to any one of 10. A second sensor that outputs a signal corresponding to the position of the car;
Car position detecting means for detecting the position of the car based on a signal output from the second sensor;
The breakage detection device according to any one of claims 2 to 11, further comprising:   The signal output from the second sensor is an encoder signal from a hoisting machine having a driving sheave on which the rope is wound, or an encoder from a governor for operating an emergency stop provided in the car. The break detection device according to claim 12 which is a signal.

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